Remove deprecated vars

These have been emitting deprecated warnings for over a full release cycle:
Q_AGENT_EXTRA_AGENT_OPTS, Q_AGENT_EXTRA_SRV_OPTS, CINDER_MULTI_LVM_BACKEND

Change-Id: I3aa5cabd6ce3a0072cba08bbca1ad23d4a831219
diff --git a/lib/cinder b/lib/cinder
index 17a0cc3..0d157dd 100644
--- a/lib/cinder
+++ b/lib/cinder
@@ -65,21 +65,14 @@
 fi
 
 
-# Maintain this here for backward-compatibility with the old configuration
-# DEPRECATED: Use CINDER_ENABLED_BACKENDS instead
-# Support for multi lvm backend configuration (default is no support)
-CINDER_MULTI_LVM_BACKEND=$(trueorfalse False CINDER_MULTI_LVM_BACKEND)
-
 # Default backends
 # The backend format is type:name where type is one of the supported backend
 # types (lvm, nfs, etc) and name is the identifier used in the Cinder
 # configuration and for the volume type name.  Multiple backends are
 # comma-separated.
-if [[ $CINDER_MULTI_LVM_BACKEND == "False" ]]; then
-    CINDER_ENABLED_BACKENDS=${CINDER_ENABLED_BACKENDS:-lvm:${DEFAULT_VOLUME_GROUP_NAME##*-}}
-else
-    CINDER_ENABLED_BACKENDS=${CINDER_ENABLED_BACKENDS:-lvm:${DEFAULT_VOLUME_GROUP_NAME##*-},lvm:cinder}
-fi
+# The old ``CINDER_MULTI_LVM_BACKEND=True`` setting had a default of:
+# CINDER_ENABLED_BACKENDS=${CINDER_ENABLED_BACKENDS:-lvm:lvmdriver-1,lvm:lvmdriver-2}
+CINDER_ENABLED_BACKENDS=${CINDER_ENABLED_BACKENDS:-lvm:lvmdriver-1}
 
 
 # Should cinder perform secure deletion of volumes?